Repeat mechanism for typewriters



Aug. 23, 19.32. R. A. MACK REPEAT MECHANISM FOR TYPEWRITERS 7 Filed Jan. 11, 1926 Patented Aug. 23, 1932 UNITED. STATES PATENT OFFICE ROBERT A. MACK, OF WASHINGTON, DISTRICT OF COLUMBIA ASSIGNOR TO WOODSTOCK TYPEWRITER 00., OF WOODSTOCK, ILLINOIS, A CORPORATION OF ILLINOIS REPEAT MECHANISM FOR TYPEWRITERS Application filed Januaryll, 1926. Serial'No. 80,395.

V a The object of the invention is to provide a 5 simple and improved device whereby a partlcular type carrier may be caused to operate repeatedly without the necessity of repeated depressions of the corresponding key.

The invention is exemplified in the com- 10 bination and arrangement of parts shown in the accompanying drawing and described in the following specification and it is more .particularly pointed out in the appended claims.

In the drawing:

Fig.1 is a vertical sectional view of a. p01 tion of a typewriter showing one embodiment of the present invention applied therey I Fig. 2 is a detail sectional view on line 2-2 of Fig. 1. v

The invention is illustrated as applied to the Woodstock Electrite typewriter but it will be understood that it is not limited to this particular type of machine. In the drawing, the numeral 10 designates the frame of a power driven typewriterhaving a toothed roller 11 journalled in the frame and extending transversely thereof. The roller 11 is continuously driven by any suitable power mechanism, not shown. The typewriter is provided with the usual key levers 12 and type bars 13. Sublevers 14 areconnected with the type bars 13 in the usual manner and pivoted on the cross bar 16.

Actuators 17 are pivoted at 18 to the sublevers 14 and are provided with hooks 19 for engaging the teeth on the power drive 11. A bar 20 is supported on end brackets 21 secured to the sides of the frame and carries a plurality of springs 22 which engage extensions 23 on the ends of the actuators 17. These springs '22 normally hold the sublevers 14 and type bars 13 in retracted position. The key levers 12 are provided with contact fingers 24 which engage lugs 25 on the corre onding actuators 17 When a key lever is epressed the finger 24 will move the hook 19 into engagement with the power drive, 11 so that the actuator will be drawn forwardly and the type bar operated. At

the end'of its movement, the extension 23 .willstrike an adjustable stop screw 26 to free the actuator from the power drive and permit the spring 22 toreturn the parts to their normal position. Each key lever 12 carries a downwardly extending projection 27 to which [a shoe 28 is attached. The shoe 28 is arranged to co-operate with interlock ing mechanism carried byacross bar 29 but this mechanism is not a part of the present invention. The mechanism thus far described is similar to that employed by the Woodstock"Electrite typewriter, described in the application of Otto A. Hokanson, Serial No. 732,615, filed August 11, 1924.

It will be noted from Fig. 2 of the drawing that the shoe 28 comprises a strap or bar of metal .bent about the projection 27 and that the lower end of the shoe is angularly bent to form a pointed end as shown'at 30. This leaves an open space 31 between the end of the shoe and the lower end of the projection 2'1. According to the present invention, a tappet in the form of a wire or rod '32 is inserted through this open space and secured in position therein in any suitable way as, for instance, by bending the end about the shoe 27 as shown at 33. The rear end of the wire 32 is bent downwardly and provided with a lateral extension 34 which overlies the extenvl9 into engagement with the power drive,,11 ,When a key lever is depressed. If the key lever is retained in depressed position, however, the projection 34 will intercept the extension 23 on the return of the actuator to its inoperative position and will hold the actuator down as it is drawn baekwardly by the spring 22. This will direct the tooth 19 into reengagement with the drive 11 so that the operation of the actuator and type carrier 13 will-be repeated. In this way, the type carrier will be automatically repeatedly opera-ted so long as a key lever is held in depressed position. 7

It will be apparent that the attachments 32 I may be readily applied to as many different key'levers as desired and may be easily detached any time that it is no longer required. The attachment will not interfere with the usual operation of the typewriter since the movement of the actuator is repeated only when the key lever is held in depressed position. If the key lever is released after it is struck, the typewriter will operate in the usual manner and only a single impression will,

be made.

I claim:

1. In a typewriter, the combination with a type carrier, of a power drive, an actuator for connecting said type carrier with said power drive, a key lever having a socket opening therein, and a tappet arranged to enter said socket opening, said tappet being held in position by said opening to enga 'e said actuator and to direct said actuator into reengagement with said power drive after. release therefrom.

2. In a typewriter, the combination with a type carrier, a power drive, an actuator for connecting said type carrier with said power drive, a key lever, an interlocking shoe mounted on said key lever and forming a socket opening therewith, and a repeat tappet engaging said socket opening and held thereby in position to. engage said actuator when said key lever is depressed.

3. In a typewriter, the combination with a type carrier, of a power drive for said type carrier, an actuator for connecting said power drive with said type carrier, said actuator having a forward extension thereon, means for disconnecting said actuator from said .power drive, a spring for returning said actuator to its initial position, a key lever, a downwardly extending projection on said key lever having a socket opening therein, and a tappet arranged to engage said socket opening and held thereby in position to engage the top of said extension when said key lever is depressed.

In testimony whereof I have signed my name to this specification on this 31 day of December, A. D. 1925.

ROBERT A. MACK. 

